Spatial Joint

Several years ago I created this joint by exploiting an idea from a sketch in an old Mechanisms and Linkages book. Using Inventor 2011, 2012 etc. you can open the .iam file, taking care to put in the same directory all the 8 files in the attached .zip file. Another videos containing both the assembling and the animation are respectively here http://youtu.be/4Em-7CP3tLY and here http://youtu.be/vXslCXo8F48